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Haigerachite

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Formula:
KFe
3+
3
(HPO
 
4
)
 
2
(H
 
2
PO
 
4
)
 
6
 · 4H
 
2
O
System:MonoclinicLustre:Vitreous
Hardness:2
Name:Named for the village and valley near the locality.


Associated with Gengenbachite.

Classification of Haigerachite

IMA status:Approved
Strunz 8th edition ID:7/C.21-30
Nickel-Strunz 10th (pending) edition ID:8.CF.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
F : With large and medium-sized cations, RO4:H2O > 1:1
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Type Occurrence of Haigerachite

Type Locality:Silberbrünnle Mine, Haigerach valley, Gengenbach, Black Forest, Baden-Württemberg, Germany

Physical Properties of Haigerachite

Lustre:Vitreous
Hardness (Mohs):2

Crystallography of Haigerachite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Cell Parameters:a = 16.95Å, b = 9.59Å, c = 17.57Å
β = 90.85°
Ratio:a:b:c = 1.767 : 1 : 1.832
Unit Cell Volume:V 2,855.70 ų (Calculated from Unit Cell)
Z:4

Optical Data of Haigerachite

Type:Biaxial (-)
RI values: nα = 1.557 nβ = 1.598 nγ = 1.602
Maximum Birefringence:δ = 0.045

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:relatively weak

Chemical Properties of Haigerachite

Formula:
KFe
3+
3
(HPO
 
4
)
 
2
(H
 
2
PO
 
4
)
 
6
 · 4H
 
2
O
Essential elements:Fe, H, K, O, P
All elements listed in formula:Fe, H, K, O, P

Relationship of Haigerachite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CF.05Grischunite
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
 · 2H
 
2
O
8.CF.05Wicksite
NaCa
 
2
(Fe
2+
 
,Mn
2+
 
)
 
4
MgFe
3+
 
(PO
 
4
)
 
6
 · 2H
 
2
O
8.CF.05Bederite
NaCa
 
2
(Mn
2+
 
,Mg,Fe
2+
 
)
 
2
Mn
2+
2
(Fe
3+
 
,Mg
2+
 
,Al)
 
2
(PO
 
4
)
 
6
 · 2H
 
2
O
8.CF.05Tassieite
(Na,◻)Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
)
 
2
(Fe
2+
 
,Mg)
 
2
(Fe
3+
 
,Mg)
 
2
(PO
 
4
)
 
6
 · 2H
 
2
O

Other Names for Haigerachite

Synonyms:
IMA1997-049
Other Languages:
German:Haigerachit
Spanish:Haigerachita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Haigerachite

Reference List:

- +
Walenta, K. and Theye, Th. (1999): Haigerachit, ein neues Phosphatmineral von der Grube Silberbrünnle bei Gengenbach im mittleren Schwarzwald. Aufschluss, 50, 1-7. (in German).
Waerstad, K. R. & Frazier, A. W. (1987): X-ray powder diffraction and single-crystal data for the isomorphous series (Fe,Al)3(K,NH4,H3O)H14(PO4)8.4H2O. Powder Diffraction 2, 187-190.
Anisimova, N., Chudinova, N. & Serafin, M. (1997): Preparation and crystal structure of potassium iron hydrogen phosphate KFe3(HPO4)2(H2PO4)6.4(H2O). Zeitschrift für Anorganische und Allgemeine Chemie 623, 1708-1714.

Internet Links for Haigerachite

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  • Raman and XRD data at RRUFF project
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  • Haigerachite details from Handbook of Mineralogy (PDF)
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    • Localities for Haigerachite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Gengenbach
          • Haigerach valley
    		Walenta, K. and Theye, Th. (1999): Haigerachit, ein neues Phosphatmineral von der Grube Silberbrünnle bei Gengenbach im mittleren Schwarzwald. Aufschluss, 50, 1-7. (in German); Wittern,A. (1995) Mineralien finden im Schwarzwald
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